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Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Provision for Income Taxes $ (42,263,336) $ (37,715,317) $ (122,676,422) $ (104,841,502)
Amounts Reclassified from Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications for the period (247,763) 1,037,510 (1,283,077) 3,980,720
Amounts Reclassified from Other Comprehensive Income | Unrealized gains on available-for-sale securities:        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Realized gain (loss) on sale of securities 145,367 2,033,819 (342,090) 6,561,834
Provision for Income Taxes (50,878) (711,837) 119,732 (2,296,642)
Total reclassifications for the period 94,489 1,321,982 (222,358) 4,265,192
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on derivatives        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Realized gain (loss) on sale of securities (526,542) (437,650) (1,631,875) (437,650)
Provision for Income Taxes 184,290 153,178 571,156 153,178
Total reclassifications for the period $ (342,252) $ (284,472) $ (1,060,719) $ (284,472)